Question about Intermatic Timer T1905 24 Hour Dial 120V 20 Amps without Skipper

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I have timer T1905 - White Wire Connet to Com Screw and dose the Black Wire Connet to the one marked clock ? We are using the Timer for a outside sign, what screws do we use for the sign -NO or NC for the Hot Wire ? and the White Wire To Com Screw ? Thanks John

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Posted on Jan 02, 2017

  • 10865 Answers

SOURCE: I am replacing 120v timer clock. new slots don't

Hello. Think of the timer as a switch. The only wires that you hook up to it are the black wires. These are the hot wires.

Take the two white wires and twist them together with a wire nut. If there is a bare wire, attach it to the ground screw. J.

Posted on Oct 23, 2010

john224
  • 1378 Answers

SOURCE: Bought an Intermatic T104 Timer for a 120v pool

T104 series intermatic timers are 208/230/277 volt clocks, not 120. I believe you have the wrong model and need a T101 series instead.

Posted on Jun 13, 2009

  • 366 Answers

SOURCE: clock does not turn on

make sure the small white wires coming from the clock itself are installed on the "line" side of the terminals, those power the clock. If not, the switch will power the pump but the clock will not run.

Posted on Sep 15, 2009

SOURCE: wiring program timer switch model t1905 intermatic

Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} See timer manual at Intermatic: click on T1905 to see pdf manual:
http://www.intermatic.com/products/timers/mechanical%20time%20switches/24%20hour%20dial%20with%20skipper.aspx
T1905 has 4 screws: NO normally open > NC normally closed > COM > Clock
NO screw is on left
NC screw is 2nd from left
COM is 2nd from right
Clock is on right

A) How to wire t1905 for 125V
You will have four wires >> a Black and White from breaker box; and a Black and White to load

1) Black hot wire from breaker connects to COM
2) White neutral wire from breaker box connects to Clock
3) White neutral wire to load connects to Clock
4) Black wire to load connects to NO -or- NC screw [one of these screws will have no wire attached]
NO turns 'off' with times set on timer
NC screw turns 'on' with times set on timer
If you want your load to turn 'on' when timer clicks 'on' then connect Black wire to NC screw

B) How to wire t1905 for 240V
You will have four wires >> 2 hot wires from breaker box; and 2 hot wires to load. These wires might be Black and White or Black and Red



1) Black hot wire from breaker connects to COM
2) Red or White hot wire from breaker box connects to Clock
3) Red or White hot wire to load connects to Clock

4) Black hot wire to load connects to NO -or- NC screw [one of these screws will have no wire attached]

NO turns 'off' with times set on timer
NC screw turns 'on' with times set on timer
If you want your load to turn 'on' when timer clicks 'on' then connect black wire to NC screw

Posted on Sep 10, 2010

SOURCE: installing a GE digital wall

Review:
Black goes to Hot wire from breaker box
Red wire goes to Load (light, fan, motor)
White wire goes to Neutral
Green to bare copper ground wire

Orientation:
Your original switch had 2 wires plus bare ground.
One of these wires is Hot, the other goes to Load.
You said original wires are Red and Black

How do you find Hot wire?
-Your original switch had 2 wires.
-Remove timer from box.
-Pull original 2 wires out where you can test them
-Turn on power
-Use regular tester
-Tape tester leads to wood sticks so your hands stay away from voltage
-Power is on
-Test each original wire to bare ground wire
-When tester lights up, that is Hot wire ... this wire connects to Black wire on timer
- The other wire goes to Load so it connects to Red wire on timer

How to test for Neutral wire
Test Hot wire to your white wires - No need to untwist them.
When tester lights up, that is Neutral
White wire from timer connects to Neutral.
Green goes to ground wire.

How to reset timer
I'm not sure which timer you have. Probably GE 15086. Reset is small round button below HOUR button. Use paper clip and push-in reset until timer flashes 12 o'clock.

Posted on Sep 30, 2010

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2 Answers

How to wire a ge 15350 timer for two 120 circuits


1) Copy following links for GE 15350 timer single-pole single-throw 120Volt timer (Made by Tork, same as Tork 1101):
http://waterheatertimer.org/GE-timers-and-manuals.html#15306

2) Use following link to control one 120volt load
http://waterheatertimer.org/images/GE-15306-wiring-250.jpg

2) To control two 120Volt loads:
Use wiring illustration above.
2nd 120V load will have black and white wire, same as 1st 120V load..
Connect 2nd black wire to terminal 2.
Both wires must be same gauge and solid wire. Do not use stranded wire under screw-down plates.
Connect 2nd white wire to terminal X.
Except do not connect more than 2 wires to screw-down terminals. Instead join white wires with wire nut, and then add jumper that connects between wire nut and screw-down terminal.

Jan 17, 2013 | Hardware & Accessories

1 Answer

Clock on T1905 timer switch has quit working. Fixable, or need a replacement?


120Volt T1905 Intermatic timer uses WG730 clock motor and 156T1950A tripper.
Timer will last many year by replacing parts, and keeping lubricated with touch of white grease, and not over-amping the 20 amp contacts
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html
http://waterheatertimer.org/How-to-wire-T1906-Intermatic-timer.html
http://waterheatertimer.org/How-to-replace-Intermatic-clock-motor.html

This timer can be converted into 208-277Volt timer by installing WG733 clock motor instead of 120Volt WG730.

Nov 13, 2012 | Intermatic Timer T1905 24 Hour Dial 120V...

1 Answer

C8835 Intermatic Timer, 30 Minute Cycle, used for and EFM coal stoker to keep it burning in summer. We are not sure how to hook up the timer, we did put the green wire on the green nut, not sure which...


Intermatic C8835 is 120Volt 30-minute cycle timer, which repeats same timing cycle every 30 minutes.
Timer has NO and NC terminals.
You will not use the NC normally closed terminal for this application, so no wire will connect to far left NC screw.

Jodie,
Green wire on green screw is correct, so you have started off well.
Bare copper wire also connects to green screw, so no more talk is needed about ground wires.

If you are using 240V or 277V, then add a comment and we'll lay out a plan for that wiring.
Wiring below is for 120V only.

You have 2 120Volt cables.
1) One cable comes from circuit breaker and has 1 black and 1 white wire.
The black 'line' wire connects to 'switch common' terminal, which is 3rd screw from left.
The white 'neutral' wire connects to 'clock' terminal, which is 4th screw from left.

2) The second cable goes to coal stoker, and has 1 black and 1 white wire.
The black wire connects to Normally Open or NO terminal which is 2nd screw from left.
The white wire connects to Clock terminal, which is 4th screw from left.

Notice that both white wires connect to same screw.

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

May 16, 2011 | Intermatic C8835 Cycle Timer

1 Answer

WH40 water heater timer: Does black wire from service box go to terminal #1 and black wire to water heater to terminal #2? Does neutral (white) from service box go to terminal #3 and neutral (white) to...


WH40 is 240Volt timer.
WH40 will not work with 120V circuit.

See WH40 wiring illustration at following link:
http://waterheatertimer.org/How-to-wire-EH40-hot-water-heater-timer.html

There are two hot wires in 240V circuit because every circuit requires two wires to complete the circuit.
Hot wires from breaker connect to terminal 1 and 3.
Notice that small white wires are also connected to terminals 1 and 3.
Small white wires power clock motor located on back of mechanism, so this says power from breaker box must arrive on terminals 1 and 3. This insures that clock motor runs continuously.
If clock motor only runs when manual override switch is clicked ON, then your Hot and Load wires are reversed.

Bare ground wire connects to green ground screw.
Wires going to Load (water heater) connect to terminals 2 and 4.

FYI: Terminal A is not used unless circuit also has a Neutral wire,
See basic water heater circuit Diagram #2:
http://waterheatertimer.org/240-v-water-heater-circuit.html

Terminal A is also used if you want to convert WH40 to 120V timer by replacing 240V clock with 120V clock.
How to convert Intermatic 240V timer to 120V timer
http://www.fixya.com/support/t7353947-intermatic_timer_wg

Dec 24, 2010 | Electric Intermatic Inc Wh40 Water Heater...

1 Answer

I the manual wiring doesn't match what I have in the switch box. This switch is to operate 2 outside porch lights., previously wired to a single pole switch as follows.. one black wire to one screw and 2...


I test these timers.
GE 15071 timer has internal clock that runs on electricity. That's why timer has extra wire.
Intermatic, GE, Tork, Leviton, Sylvania, Woods, Utilitec etc in-wall timers each wire the same way.
The only tiny difference is GE doesn't have green ground wire.
http://waterheatertimer.org/Program-wire-Utilitec-0192773.html

Here's what to do:
1) Old switch has two screws (excluding green ground screw)
One screw on old switch has 2 black wires >> these are hot wires > timer black wire connects to these hot wires. This will power the timer.
2) The other switch wire connects to timer red wire. This will send timer signal to lights.

3) Timer white wire is for the timer clock.
Timer white wire connects to other white wires that are twisted together and covered with wire nut >>> these are neutral wires, and now timer clock will operate
4) For EZ connection to other white wires, strip back another inch on timer white wire so stranded wire can wrap like a candy cane around solid copper wires. Then twist wire nut on very tight.

5) When wiring is complete, push door on timer for manual override. Lights should turn ON-OFF. If lights do not turn on, reverse timer red and timer black wires. Make sure outdoor bulbs are working.

Add a comment any time

Dec 14, 2010 | Intermatic Inc. ST01C Digital In-Wall...

1 Answer

New switch GE model 15265 ... to light up 2 lightbulbs outside. Old switch all cables are black. Those who light up the tester are the hot=Red/black?? Those which do not light up are white?? Green I know...


Manual for GE 15265
http://waterheatertimer.org/pdf/GE-15265-manual.pdf
15A timer works fine on two bulbs, up to 1440 total watts.

If old switch has 2 screws plus green ground screw, then timer is right.
If old switch has 3 screws plus green ground screw, 15265 doesn't replace 3-way switch.

Timer-green wire connects to bare ground wire

Old switch has 2 screws with wires on each.
One wire is Hot-from breaker and this connects to timer-black wire.
One wire Goes-to-lights and this connects to timer-red wire.
If you get these two wires reversed, timer will not work, so reverse them.
It will not blow circuit if the timer-red and timer-black wires are reversed.

Timer-White wire is the confusing wire for everybody:
Timer-white wire runs clock motor located inside timer.
In back of electric box are neutral white wires that are twisted together and covered with wire nut.
Connect timer-white to these neutral wires.
If box does not have neutral white wires, connect timer-white to bare ground wire.

geno_3245_61.jpg

Nov 13, 2010 | Intermatic Inc. EJ500C Digital Wall Switch...

2 Answers

I have a wall switch and two outside ligthts. there appers to be two black wires to old switch. Timer has white, black, red, and green. I hagve tried all wiring scemes and get lights to stay and not turn...


You posted under the ST01C timer.
ST01C has black, red and blue wires, and has a battery to run the clock.

You have black, white, red and green.
So your timer has an electronic clock and no battery.

Let's go through the wires one at a time.
You can add a comment and I will help further if needed.

Old switch has 2 black wires.
One of these wire is black-Hot
The other wire is black-to-Load (load is your light, fan, motor)

Black-Hot connects to timer-black wire
Black-to-Load connects to timer-red wire
NOW ... if these wires are reversed, the timer will not operate, so simply reverse the wires.

There are two wires to go:
Timer-green wire goes to bare copper wire.
Timer-white wire is the wire that runs the clock inside the timer. This is just like plugging in your alarm clock so the clock runs.

The timer-white wire connects to the other white wires located inside the box.
These white wires are usually twisted together and covered with a wire nut.
So untwist the wire nut and add the timer-white wire to these wires.
What if your box does not have these other white wires?
Then in that case, connect the timer-white wire to the bare copper and the clock will run.

geno_3245_14.jpg

Nov 06, 2010 | Intermatic Inc. ST01C Digital In-Wall...

1 Answer

How do i wire my diehl 880 ?


1) Here is Diehl 880 instruction manual

2) Diehl 880 is 120V timer
-1/2 HP
-1000 Watt tungsten. Tungsten means incandescent light bulbs.

3) Checklist:
a) Your load does not exceed capacity > Timer is too lightweight to control 1500 toaster oven.
b) You need 120V line coming from breaker box with black Hot wire and white Neutral
c) You need 120V line going to Load that also has black and white wire
d) Test each black wire to ground to see which black wire is HOT

4) Deihl 880 sell sheet pdf says 880 is available SPST (single pole single throw) -or- SPDT (single pole double throw).
-The difference is pole #4 on the timer.
-If you are trying to turn one circuit off just as another circuit turns on, then you need the SPDT
-If you are turning one circuit on-and off, then the following instructions are for you

5609d99.jpg

5) Wire clock
-There are 5 poles > look for markings 1-thru-5
-If no marking, then poles 1&2 are probably spaced apart from other poles
-Connect Hot and Neutral wires to poles 1&2 >> this powers clock motor, they go on either pole

-Pole 4 not used

6) Wire timer
-Poles 3&5 are timer circuits
-Connect Hot line to pole 3
-Connect black wire going to Load to pole 5
-Connect white wire from Load to Neutral

Oct 01, 2010 | Diehl TIME CLOCK- 120V 24 HOUR

1 Answer

Model T104P wiring instructions for 110volt motor


T104 timer is for 240 Volt circuits. It has internal 240V clock motor. Clock terminals and timer terminals are connected, so there is no way this timer can control 110V circuit.
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html

T101 timer is for 110V circuit.
T101 has 110V clock motor
Both white neutral wires = terminal A.
Black hot wire from breaker box = terminal 1
Black wire to load = terminal 2.
Grounds = green screw
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T103 timer is for 110V circuit
T103 has 110V clock motor
Both white neutral wires = terminal A.
Black hot wire from breaker box = terminal 3
Black hot wire to load = terminal 4
Grounds = green screw

T1905 timer is for 110V circuit.
T1905 has 110V clock motor
Both white neutrals = Clock terminal
Black hot from breaker = COM
Black to load = NO [load comes on when timer turns on]

Sep 21, 2010 | Intermatic & Indoor/Outdoor Rain Tight...

1 Answer

Wiring program timer switch model t1905 intermatic


Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} See timer manual at Intermatic: click on T1905 to see pdf manual:
http://www.intermatic.com/products/timers/mechanical%20time%20switches/24%20hour%20dial%20with%20skipper.aspx
T1905 has 4 screws: NO normally open > NC normally closed > COM > Clock
NO screw is on left
NC screw is 2nd from left
COM is 2nd from right
Clock is on right

A) How to wire t1905 for 125V
You will have four wires >> a Black and White from breaker box; and a Black and White to load

1) Black hot wire from breaker connects to COM
2) White neutral wire from breaker box connects to Clock
3) White neutral wire to load connects to Clock
4) Black wire to load connects to NO -or- NC screw [one of these screws will have no wire attached]
NO turns 'off' with times set on timer
NC screw turns 'on' with times set on timer
If you want your load to turn 'on' when timer clicks 'on' then connect Black wire to NC screw

B) How to wire t1905 for 240V
You will have four wires >> 2 hot wires from breaker box; and 2 hot wires to load. These wires might be Black and White or Black and Red



1) Black hot wire from breaker connects to COM
2) Red or White hot wire from breaker box connects to Clock
3) Red or White hot wire to load connects to Clock

4) Black hot wire to load connects to NO -or- NC screw [one of these screws will have no wire attached]

NO turns 'off' with times set on timer
NC screw turns 'on' with times set on timer
If you want your load to turn 'on' when timer clicks 'on' then connect black wire to NC screw

Sep 10, 2010 | Intermatic Timer T1905 24 Hour Dial 120V...

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